Possible Clues:

• Biologists initially shoot two under naturalist's ship
• Ship on which Darwin collected material for "On the Origin of Species"
• Eel squirms in bag on naturalist's vessel.
• Hunting dog beginning to bother bird of prey
• Is Lassie on vacation saving a good dog?
• Darwin sailed on this ship in his first research voyage
• Bird of prey pursuing bishop’s dog
• Bird sitting next to black dog
• Hound British bird of prey
• Short-haired dog